During her long reign Her Majesty the Queen has known 11 prime ministers. Although politically neutral, her experience of public affairs means she knows more about the inner workings of each government than anyone currently serving in Parliament. Ministers value their weekly audience given by the Queen. However, what is that relationship like and how have successive Prime Ministers sought to influence or change the monarchy while at the same time seeking to preserve it? Features exclusive, recently conducted interviews with Andrew Pierce, Andrew Roberts, Simon Heffer, Sarah Bradford, Penny Jonor, Dickie Arbiter and Nick Owen